.art-shell{box-sizing:content-box;max-width:var(--readmax,800px);padding:0 var(--sec-px,56px);margin:0 auto}.art-body{position:relative}.art-main-col{min-width:0}.art-toc-rail{width:200px;height:100%;margin-left:64px;position:absolute;top:0;left:100%}.art-toc-rail-inner{position:sticky;top:40px}.art-toc-inline{margin:var(--space-4) 0 var(--space-6);display:none}.art-toc-inline__summary{min-height:var(--space-12);justify-content:space-between;align-items:center;gap:var(--space-4);padding:0 var(--space-4);border:1px solid var(--rule);border-radius:var(--radius-xs);cursor:pointer;transition:border-color var(--dur-hover) var(--ease);list-style:none;display:flex}.art-toc-inline__disclosure:hover .art-toc-inline__summary,.art-toc-inline__disclosure:hover .art-toc-inline__list{border-color:var(--ink)}.art-toc-inline__disclosure[open] .art-toc-inline__summary{border-bottom-color:#0000;border-bottom-right-radius:0;border-bottom-left-radius:0}.art-toc-inline__summary::-webkit-details-marker{display:none}.art-toc-inline__icon{color:var(--mute);font-family:var(--font-sans);transition:transform var(--dur-hover) var(--ease);font-size:24px;line-height:1}.art-toc-inline__disclosure[open] .art-toc-inline__icon{transform:rotate(45deg)}.art-toc-inline__list{padding:var(--space-2) var(--space-4) var(--space-4);border:1px solid var(--rule);transition:border-color var(--dur-hover) var(--ease);border-bottom-left-radius:var(--radius-xs);border-bottom-right-radius:var(--radius-xs);border-top:0;grid-template-columns:minmax(0,1fr);margin-top:0}.art-prose-h2{border-top:1px solid var(--rule);margin:var(--space-14) 0 22px;padding-top:var(--space-8)}.art-prose-h2:first-child{margin-top:var(--space-2);border-top:0;padding-top:0}.art-header--feature{padding-top:var(--space-16);padding-bottom:var(--space-14);margin-bottom:var(--space-10);border-bottom:2px solid var(--ink)}.art-header--feature:has(+.art-toc-inline){padding-bottom:var(--space-8);border-bottom:0;margin-bottom:0}.art-header-feature-grid{gap:var(--space-14);margin-top:var(--space-8);grid-template-columns:minmax(0,1.08fr) minmax(340px,.92fr);align-items:center;display:grid}.art-header-feature-grid--single{grid-template-columns:minmax(0,1fr)}.art-header-feature-grid--single .art-header-deck{max-width:none}.art-header-feature-copy{align-items:flex-start;gap:var(--space-5);flex-direction:column;min-width:0;display:flex}.art-header-deck{max-width:590px;color:var(--mid);font-family:var(--font-sans);font-size:var(--fs-body-lg);line-height:var(--lh-relaxed);text-wrap:pretty}.art-header-deck p{margin:0}.art-header-meta-group{align-items:flex-start;gap:var(--space-2);flex-direction:column;min-width:0;display:flex}.art-header-feature-visual{min-width:0}@media (max-width:1280px){.art-toc-rail{display:none}.art-toc-inline{display:block}}@media (max-width:920px){.art-shell{padding:0 24px}.art-header-feature-grid{gap:var(--space-10);grid-template-columns:1fr}.art-header-feature-copy{max-width:720px}}@media (max-width:480px){.art-header--feature{padding-top:var(--space-10);padding-bottom:var(--space-10)}.art-header-feature-grid{margin-top:var(--space-6)}}.toc-rail-link{font-family:var(--font-sans);color:var(--mute);border-left:2px solid var(--rule);padding:7px 0 7px 14px;font-size:13.5px;line-height:1.35;text-decoration:none;transition:color .12s cubic-bezier(.2,0,0,1),border-color .12s cubic-bezier(.2,0,0,1);display:block}.toc-rail-link:hover{color:var(--ink)}.toc-rail-link.is-active{color:var(--ink);border-left-color:var(--terra)}#read-progress{z-index:200;width:0;height:3px;transition:width 80ms linear;position:fixed;top:0;left:0}